Which of the following statements about object oriented database is NOT correct
Which of the following statements about object oriented database is NOT correct ?
A．Each object has a unique object identity in the system
B．Encapsulation and inheritance are two important features of object oriented database
C．A subclass can inherit the attributes and methods of all its superclasses
D．A superclass includes the attributes and methods of all its subclasses
正确答案：D
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